I went looking on Amazon for a recent monograph on Paul’s great charter of freedom and equality before God in Galatians 3.28. I found it, and it costs £66 – looks like inter-library loan time.
No Longer Male and Female: Interpreting Galatians 3:28 in Early Christianity (Library of New Testament Studies) Pauline Hogan (2008)
However the first page of hits for the simple search phrase “male and female in Paul” brought up some titles grippingly irrelevant for my purposes. Here’s three of them.....
Pay Differences Among the Highly Paid: the Male-Female Earnings Gap in Lawyers' Salaries (Discussion paper / Institute of Public Policy Studies, University of Michigan) by Robert G. Wood, Mary E. Corcoran and Paul N. Courant (Paperback - 1991)
"Other People's Money": An Empirical Examination of the Motivational Differences Between Male and Female White Collar Offenders. by Paul Michael Klenowski (2 Sep 2011)
I took the photo in Glen Dye - it's a Scottish blackface sheep reared on a grass and bracken diet fed quite high up the hill!